#157863  by Skiwi
 Thu Jan 09, 2020 8:04 am
On behalf of us all I'd like to thank the guinea pigs/ test pilots for their work on this one ;)
 #157866  by Nomadic
 Thu Jan 09, 2020 8:50 am
Skiwi wrote:
Thu Jan 09, 2020 8:04 am
On behalf of us all I'd like to thank the guinea pigs/ test pilots for their work on this one ;)
Seconded
 #157867  by divxmaster
 Thu Jan 09, 2020 8:53 am
No problems, glad to give back to this great community!

Hey Nomadic/David, did you get my PM? (Things have been jamming in outbox lately for some reason)

edit: Im charging the battery back up now with my poor little hobby charger at 3A, will take a few days but at least I will be able to get an exact reading.

Cheers,
Mike.
 #157871  by divxmaster
 Thu Jan 09, 2020 9:43 am
Just a reminder that I havent fully tested this battery, I dont have an inverter to fully test high/long drain on it. So much more extensive testing is required before their true capacity is known.
Hopefully Johnny can do some more extensive tests.

Cheers,
Mike
 #157873  by scubadoo
 Thu Jan 09, 2020 10:38 am
I have moved my last post from https://nzmotorhome.co.nz/forum/viewtop ... 50&t=19930.
Probably a more relevant thread for anyone searching.

Paralleling internal BMS managed battery packs concerns me a little.
Consider this.
If each pack can deliver 180A (continuous I hope). Parallel 2 packs.
Now draw let's say 250A. No issue provided the BMS ouput current levels are identical. Extremely unlikely.
At some point one BMS will trigger that mysterious only known by the designer low level alarm point and shut down.
The appliance(s) still want to draw 250A. What now? Does the now overloaded remaining mysterious BMS circuit calmly and safely shutdown, blow internal fuses or links, release smoke or self destruct :?: :? Hopefully the first option on each and every occasion.

Restrict draw to 180A and everything should be fine. Few existing 100-200Ah"plug in" LiFePO4 battery internal BMS devices can safely handle a continuous 180A though. Well the ones I have researched, Battle Born included. Victron users rejoice.

Our Sinopoly 300Ah LiFePO4 pack can safely deliver 1000A plus.
 #157875  by divxmaster
 Thu Jan 09, 2020 11:54 am
Hi Scubadoo,

Yes I've certainly thought through your points a lot. I would run a 170amp or so circuit breaker as the first thing of each battery.

But yes, I certainly dont want to draw anywhere near 180amps, 1500w should be 125-135a, depending on inverter efficiency. I have my eye on the kings adventure 1500w pure sine, only $279! seems the best deal I can find.

Hows this for an idea.. run a split system. so one 270ah is your main battery, runs inverter, waterpump, fridge etc and is always connected to solar/etc. The two 270ah batteries are not connected. The second 270ah just connects to the 2nd inverter only. The charging connections are switched to the 2nd battery. Only when you arent using either inverter, do you switch the 2nd battery to the charging sources. $1279 for the 2nd battery setup (ok plus Circuit breaker, isnt too bad).

Cheers,
Mike.
 #157876  by Nut17
 Thu Jan 09, 2020 12:10 pm
I have now purchased about a dozen of these 2000 watt PSW inverters from this bloke. I have had one failure which was replaced without question at around 12 months. The current model he is selling has a very handy cordless remote for powering on and off. They run quietly and have a very low no load idle current draw.

https://www.trademe.co.nz/motors/carava ... 9cd063-001
 #157878  by divxmaster
 Thu Jan 09, 2020 12:22 pm
Oh cool, thanks Chris,
I will look into that one, was thinking I might run 2000w inverter with 1500w appliances to be safe.
You run 2000w inverter plus 2000w hob right? No issues with it being so close to max draw?

Cheers,
Mike
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