Re: [RE-wrenches] small lithium chargers, say 20-50 amps

2021-12-03 Thread Kirk Herander 
At the risk of stating the obvious, If you are talking 208 L - L single
phase, use the chargers in multiples of three to balance the load on
whatever AC source you're charging from. If the charger has to be fed 240
single phase, 208-240v buck-boost xformers will do the job. The old stand
by 240vac to 48vdc chargers of my preference are the Lester models.

On Fri, Dec 3, 2021 at 10:55 AM jay  wrote:

> As larger chargers are seemingly hard to come by, let me ask a different
> question.
>
>  What about smaller 20-50 amp 48v nominal chargers that are programable
> for lithium.
> Again 208vac input.
>
> Jay
>
>
>
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-- 

*Kirk Herander / **kirkh@vermont.solar *

*Owner|Principal, VT Solar, LLC*

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dba Vermont Solar Engineering

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[RE-wrenches] small lithium chargers, say 20-50 amps

2021-12-03 Thread jay 
As larger chargers are seemingly hard to come by, let me ask a different 
question. 

 What about smaller 20-50 amp 48v nominal chargers that are programable for 
lithium.
Again 208vac input. 

Jay



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Re: [RE-wrenches] Large lithium chargers

2021-12-03 Thread jay 
HI Nick,

Thanks for the idea.  I didn’t consider theSMA/ SI/MC because at this point its 
a legacy product and I wouldn't want to have to deal with potential lack of 
parts, technical support  or warranty should something go wrong. 

Also my understanding is that the MC box for larger systems isn’t UL listed?

I think my buddy is probably going with Sol-Ark’s.  He’s done a few large ones 
already and has an understanding of most of the bugs and work arounds.  

Its why he wants external chargers as he has had some real issues with 
inverters turning off on generator shut down.  Sol-ark is working on some kind 
of fix, but its a known issue. 

thank

jay



> On Dec 3, 2021, at 12:35 AM, Nick A Lucchese  wrote:
> 
> Hello Jay,
> 
> This was my same dilemma I posted about recently although not 208. Have you 
> considered SMA Islands in a Multicluster system? I did one last year and 
> other than tracking down a mis-wire on the CT’s in the Multicluster box it’s 
> been working extremely well. Do you know what brand of batteries yet? Blue 
> Ions are closed loop communications with the Islands now so it works 
> beautifully. There’s some reasonable deals on many of the Sunny Island 6048’s 
> right now from the DC Solar auctions too. One of the last ones just ended 
> yesterday actually. It would likely be easy to find many at 25-33% less than 
> the old distributor’s pricing.
> 
> Would love to hear what you decide to do with this. Best of luck, Nick
> 
> 
> 
> 
>> On Dec 2, 2021, at 7:53 AM, Jay  wrote:
>> 
>> Hi all
>> 
>> Sorry I guess I didn’t explain the clients wants well enough
>> 
>> 1. 90-100kwh+ 48 vdc lithium battery 
>> 2. 208 3 phase AC generator powering 48v nominal battery chargers.
>> 208-3phase as that is the house/EE design voltage. 
>> 3. AC generator because it’s back up if the inverters fail, so no DC 
>> generator. 
>> 4. Client doesn’t want any drop outs or have to reset clocks etc during 
>> generator/inverter- charging/switchover.
>> 5. Inverter size is not decided yet, probably 40-80kw. 
>> 6.  Generator size isn’t specified yet, but given the loads 60-125kw 
>> probably. 
>> Size would be based on battery charging or max ac load which ever is larger. 
>> 
>> That leads me external chargers. 
>> 
>> I’m looking for large programmable battery chargers for lithium batteries 
>> powered from a 208-3phase ac generator in the 60-125 kw size range. 
>> 
>> Thanks
>> 
>> Jay
>> 
> 
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