Most of the EG4 inverters and batteries in closed loop have built in battery RSD.
It shuts off the Bms and trips the battery breaker.
A restart requires manual reset.
Jay On Jul 29, 2025, at 11:07 AM, William Miller via RE-wrenches <[email protected]> wrote:
Friends:
As I see it there are three reasons to have this disconnecting means:
1. Section 705 Code requirement. 2. Disconnecting for service. 3. Rapid shutdown for first responders.
It would be ideal if batteries with BMS systems had contact-closure triggered inhibit system. The capability is baked into the circuitry, I am sure. This would be far superior to heavy duty DC knife switches. I am discussing that with Deka for the Duration line.
For first responders I have argued that the batteries that ultimately power fire alarms or fire pumps should not be disconnected, avoiding the requirement for reason 3 above.
I suspect 100 amps may be an insufficient rating for your batteries if they have 80 amp disconnects and there are more than one.
I would be arguing the breaker(s) on the inverter are sufficient. Is it possible to provide a lock-out on that breaker?
Keep us posted. This could happen to any of us.
On Tue, Jul 29, 2025 at 9:24 AM MD Electric & Solar via RE-wrenches < [email protected]> wrote: Correct, it does not have an external disconnect, but if you open the cover, each battery has it's own disconnect and the Sol-Ark has a battery disconnect. Looks like I'm in the market for a 100 amp rated outdoor, lockable DC rated knife switch. Mike
I had to look up that battery enclosure and if I understand correctly it does not have an external breaker/disconnect so yes the inspector is correct in the need for one if I understand.
jay
Here is the reference, attached. I’ll let the code experts chime in, but I would ask for the code reference they are referring to.
The only one I can think of has to do with if the batteries are on the other side of a wall.
Thats as clean an install as they come
jay
> On Jul 29, 2025, at 9:43 AM, MDElectricSolar <[email protected]> wrote:
>
> <image0.jpeg>
> Michael D Nelson
> MD Electric & Solar, Inc.
> 707-684-0064 mobile
> 707-884-1862 office
> www.mdelectricsolar.com
> www.facebook.com/mdelectricandsolar
>
>
>> On Jul 29, 2025, at 8:06 AM, Jay via RE-wrenches <[email protected]> wrote:
>>
>> What is the layout of the equipment
>>
>> Are the batteries next to and therefore in sight of the inverter?
>>
>> Jay
>>
>>> On Jul 29, 2025, at 8:44 AM, MDElectricSolar via RE-wrenches <[email protected]> wrote:
>>>
>>> Wrenches,
>>> I have a building inspector in my county of Sonoma who has just told me that we need to install a rapid shutdown switch of some type between my LFZ battery bank and my Solark 15k inverter. He mentioned some type of knife switch within 5 feet of the equipment. I cannot find any reference to this requirement anywhere but he insists it is required. These batteries happen to be simplify or brakes and Stratton batteries and each battery has its own 80 amp breaker on the battery and the Solark has a battery disconnect switch built-in. We do have module level RSD which kills the solar output as well as the inverter output when the button is pushed. Does anyone have any experience with this or can they point me to the correct code section or what are others doing to comply with this requirement?
>>>
>>>
>>> Michael D Nelson
>>> MD Electric & Solar, Inc.
>>> 707-684-0064 mobile
>>> 707-884-1862 office
>>> www.mdelectricsolar.com
>>> www.facebook.com/mdelectricandsolar
>>>
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-- Michael D Nelson
MD Electric & Solar Inc. Office: 707-412-3181 Cell: 707-684-0064
--
Michael D Nelson
MD Electric & Solar Inc. Office: 707-412-3181 Cell: 707-684-0064
List sponsored by Redwood Alliance
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