In those unsettling moments when the lights flicker, it's easy to stay calm knowing that service will be restored quickly by trained professionals.
But how would you keep things like heat, medical equipment, and electronic devices going if the power is out for longer than expected?
The Grid Doctor 3300XP Expansion Battery Kit is the extended power supply you need in emergencies and a must-add to your Grid Doctor 3300 Solar Generator System.
EXPERIENCE ULTRA-FAST CHARGING WITH 1800W POWER: Our advanced bilateral inverter technology outpaces traditional charge controllers, offering lightning-fast solar charging in just 3-4 hours, and even quicker wall charging in 2.4 hours. Power up at unprecedented speeds and stay ready for anything.
When a crisis comes, keeping things as normal as possible is essential for your family. With the Grid Doctor 3300XP Expansion Battery Kit, you can maintain a level of routine far longer, giving you a sense of security and control.
To keep the typical household operating as usual in an emergency lasting three days, the average homeowner would need to pair the Grid Doctor 3300 generator battery with multiple 3300XP expansion batteries.
This setup can keep it all running:
Sheltering in place at home or setting up camp, you’ll value the versatility that comes with these 3300XP battery units. Stack them on top of your Grid Doctor 3300 generator battery to charge, building an impenetrable "power tower." Use them in that way while they charge or disconnect the units and use them individually. This is an ideal option for large groups and big families, distributing power to those who need it—in their own space.
Implements cutting-edge technology to charge your electric appliances significantly faster than conventional power sources.

Thanks to pass-thru charging, there’s no need to wait for a full battery. Charge the generator while you use it to power your electric appliances and keep your household running! This uninterrupted power supply allows you to keep essential electronics operational at all times.
Being able to use your much-needed electronics as the battery charges is an invaluable asset in an emergency.
You won’t go without what you need:
This battery provides protected charging options. Maximum Power Point Tracking, or MPPT, protects you and your electronics in an emergency through efficient charging.
This efficient charging refuels faster, ensuring your electronics operate fully sooner. Plus, the more efficient your energy use, the longer your electronics can run. Energy efficiency is optimal, reducing your dependence on unstable or unavailable power grids and making you more self-sufficient during disasters!
When it comes to backup power, nothing matters more than safety. That’s why every Grid Doctor product uses advanced Lithium Iron Phosphate (LiFePO₄) battery technology – not the cheaper, riskier lithium-ion batteries used in many competing systems.
Here’s what that means for you:
The biggest concern with the lithium-ion batteries found in many competitor products is something called thermal runaway – a chain reaction that can cause overheating, smoke, and even fire or explosions.
This is the same battery chemistry that has caused fires in electric scooters, e-bikes, and even EV recalls.
Grid Doctor’s Lithium Iron Phosphate batteries don’t do that. They’re chemically stable, even under stress. They won’t catch fire if punctured, overheated, or overcharged.
That’s why, in aircraft backup systems and other situations where failure isn’t an option, they use the same LiFePO₄ battery technology you’ll find in Grid Doctor solar generators and power banks.
After all, Grid Doctor systems are designed to operate indoors – often near your family, pets, and valuables. That’s why we refuse to compromise on battery safety.
Most lithium-ion batteries degrade quickly, often losing capacity after just 500 charge cycles.
Grid Doctor’s LiFePO₄ batteries last for 3,000+ cycles. That’s years of use, even if you charge and discharge your power system every day.
This longer lifespan also saves you money, because you won’t have to replace your battery system nearly as often.
Whether it’s a freezing blizzard or sweltering heat wave, you need power that won’t fail when you need it most.
While storing your batteries in a temperature-controlled environment is recommended, Grid Doctor’s LiFePO₄ batteries perform much better in extreme temperatures than lithium-ion systems. They’re far less likely to swell, degrade, or fail under stress.
This makes them a superior choice for home emergency power, bug-out locations, and mobile power needs.
We believe the best technology is the safest technology. That’s why every Grid Doctor solar generator, expansion battery, and power bank we sell is built around non-flammable Lithium Iron Phosphate cells.
It costs a little more to do it right – but we wouldn’t trust anything else to protect your family.
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
In those unsettling moments when the lights flicker, it's easy to stay calm knowing that service will be restored quickly by trained professionals.
But how would you keep things like heat, medical equipment, and electronic devices going if the power is out for longer than expected?
The Grid Doctor 3300XP Expansion Battery Kit is the extended power supply you need in emergencies and a must-add to your Grid Doctor 3300 Solar Generator System.
EXPERIENCE ULTRA-FAST CHARGING WITH 1800W POWER: Our advanced bilateral inverter technology outpaces traditional charge controllers, offering lightning-fast solar charging in just 3-4 hours, and even quicker wall charging in 2.4 hours. Power up at unprecedented speeds and stay ready for anything.
When a crisis comes, keeping things as normal as possible is essential for your family. With the Grid Doctor 3300XP Expansion Battery Kit, you can maintain a level of routine far longer, giving you a sense of security and control.
To keep the typical household operating as usual in an emergency lasting three days, the average homeowner would need to pair the Grid Doctor 3300 generator battery with multiple 3300XP expansion batteries.
This setup can keep it all running:
Sheltering in place at home or setting up camp, you’ll value the versatility that comes with these 3300XP battery units. Stack them on top of your Grid Doctor 3300 generator battery to charge, building an impenetrable "power tower." Use them in that way while they charge or disconnect the units and use them individually. This is an ideal option for large groups and big families, distributing power to those who need it—in their own space.
Implements cutting-edge technology to charge your electric appliances significantly faster than conventional power sources.

Thanks to pass-thru charging, there’s no need to wait for a full battery. Charge the generator while you use it to power your electric appliances and keep your household running! This uninterrupted power supply allows you to keep essential electronics operational at all times.
Being able to use your much-needed electronics as the battery charges is an invaluable asset in an emergency.
You won’t go without what you need:
This battery provides protected charging options. Maximum Power Point Tracking, or MPPT, protects you and your electronics in an emergency through efficient charging.
This efficient charging refuels faster, ensuring your electronics operate fully sooner. Plus, the more efficient your energy use, the longer your electronics can run. Energy efficiency is optimal, reducing your dependence on unstable or unavailable power grids and making you more self-sufficient during disasters!
When it comes to backup power, nothing matters more than safety. That’s why every Grid Doctor product uses advanced Lithium Iron Phosphate (LiFePO₄) battery technology – not the cheaper, riskier lithium-ion batteries used in many competing systems.
Here’s what that means for you:
The biggest concern with the lithium-ion batteries found in many competitor products is something called thermal runaway – a chain reaction that can cause overheating, smoke, and even fire or explosions.
This is the same battery chemistry that has caused fires in electric scooters, e-bikes, and even EV recalls.
Grid Doctor’s Lithium Iron Phosphate batteries don’t do that. They’re chemically stable, even under stress. They won’t catch fire if punctured, overheated, or overcharged.
That’s why, in aircraft backup systems and other situations where failure isn’t an option, they use the same LiFePO₄ battery technology you’ll find in Grid Doctor solar generators and power banks.
After all, Grid Doctor systems are designed to operate indoors – often near your family, pets, and valuables. That’s why we refuse to compromise on battery safety.
Most lithium-ion batteries degrade quickly, often losing capacity after just 500 charge cycles.
Grid Doctor’s LiFePO₄ batteries last for 3,000+ cycles. That’s years of use, even if you charge and discharge your power system every day.
This longer lifespan also saves you money, because you won’t have to replace your battery system nearly as often.
Whether it’s a freezing blizzard or sweltering heat wave, you need power that won’t fail when you need it most.
While storing your batteries in a temperature-controlled environment is recommended, Grid Doctor’s LiFePO₄ batteries perform much better in extreme temperatures than lithium-ion systems. They’re far less likely to swell, degrade, or fail under stress.
This makes them a superior choice for home emergency power, bug-out locations, and mobile power needs.
We believe the best technology is the safest technology. That’s why every Grid Doctor solar generator, expansion battery, and power bank we sell is built around non-flammable Lithium Iron Phosphate cells.
It costs a little more to do it right – but we wouldn’t trust anything else to protect your family.
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.









