Lithium batteries and microwave use

12thgenusa wrote:
At the time, most agreed that a pair of GC2s in series were marginal to operate a microwave.

My First RV had a pair of Interstate GC2 golf cart batteries and a 2000 watt inverter. I owned that rig for 7 camping seasons. Microwave always ran fine on that system.

12thgenusa wrote:
Does anyone have experience operating the microwave with 200 Ah of lithium?

YEP.

I had two Battleborns in my Nash 17k for about a year and a half. The Microwave worked fine on them along with the Victron Multiplus 2000 inverter. I think I installed them in early 2019.
In 2020 I sold that rig, and then bought a different truck camper and moved the whole works into my AF992 truck camper in late 2020.

Microwave still runs perfect with the same inverter and batteries.

I've had two other RVs with 200 amp hours of batteries and a 2000 watt inverter to run the microwave. They've all performed flawlessly.

I’ll make my question a bit clearer.

When I designed and installed my system 12 years ago, lithium was still a dream for RVs. The battery discussions revolved around whether it was best to use a 12-volt battery or multiples of them, 6-volt batteries in series, or break the bank and go with AGM.

At the time, most agreed that a pair of GC2s in series were marginal to operate a microwave. That convinced me to go with four GC2s (440 Ah).

My specific question is, are the characteristics of lithium batteries sufficiently different from FLAs that 200 Amp hours of lithium batteries with at least a 200 amp BMS will operate the microwave without voltage sag causing inverter under-volt alarm or shutdown?

Should be, is not a helpful answer.

You should be able to use a microwave for short periods of time as well as a coffee maker if you choose.
It sounds like you already have some solar to replenish your bank so as long as it's somewhat sunny your good to go.

You didn't state it but Im sure you know you need an Inverter for the 120vac devices correct?

We have a bit more capacity at 560ahrs and I installed a 3kw Inverter for our AC loads when we need them.
Got 510w of solar on the roof as well so that pretty much tops us off when we do use the Inverter.
Good luck.

Based upon the topic title I was going to say "Don't use lithium batteries in a microwave!" :)

12thgenusa,

So long as the Li are wired in a balanced manner, there should be no issue.

I'd wait until the existing bank dies. Prices continue to drop.