Bluetti with 24v battery?

[Johnno]

Hi I already own a Bluetti ac180 which I hope to use in a small camper build. The inverter is large enough to power my cooking needs but doesn’t output enough dc really to startup a fridge. Plus its capacity is quite small.

Instead of buying larger power stations with 30amp dc outputs I was considering buying a smallish 24v battery which I could connect the fridge directly to and charge the Bluetti. The Bluetti can power the 12v lights.

To charge this battery I’d buy a 12/24 dcdc charger. Then from the 24v battery I’d connect to the Bluetti to charge this. Since it’s always connected and will draw 10amps I’m figuring 240w is enough to keep it topped up over the day. I already own this which works well, and will incorporate it somehow.

does this sound like it would work, and is the best and most cost efficient way of reusing my Bluetti ac180 to provide the power (2kwh +) I want?

Comments and advice welcome!

 

[HarryN]

If the need is mostly for nominal 12 volt end use, you could just buy a 100 - 300 amp 12 volt battery and charge it up from your various sources, or something similar in 24 volt.

Hook up a fuse block to it and charge / discharge through the fuse block.

Sort of like post #5 of this test fixture I have been playing with.

The same fuse block can be used for 12 or 24 volt so it can match with your end appliances.

Each fuse can handle 30 amps. Just put a breaker in between the battery and the fuse block to cut power in case of a significant short.

This way also there is no standby power being used.

The bluetti is a decent unit, but really intended for just powering one or two max DC items - like at a picnic.

H

Thread 'Small test fixture'

Jan 10, 2024

Sometimes it is easier to show people things in photos than to describe them.

So I made a little test fixture from left over parts, nothing fancy.

In this case, some people asked about methods of dealing with pre-charging the capacitors on the input stage of inverters, and I had suggested that they try to just have a small solar panel connected to it as one approach.

So here are a few pics.

• HarryN
• Replies: 37
• Forum: Show and Tell

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