Dave,
I would first suspect the generator, not the inverter. Check its output
voltage and Hz under load. If it's overloading, either (or both) voltage
and frequency will drop below the acceptable range and the inverter will
unlatch its input relays, wait for a bit, relatch and ramp up input amps
until it again overloads and the cycle repeats. You may reduce either
(or both) charging amps and overall input amps, broaden the frequency
and minimum voltage acceptance ranges (I don't recommend this), adjust
the AC output voltage of the generator, or advise them to get a better
gennie.
Allan
On 12/15/2020 11:14 AM, Dave Tedeyan wrote:
Hi All,
I am going to service a system where the homeowner is telling me that
their Conext SW4048 had been working fine for 14 months, and then all
of a sudden recently stopped being able to charge the batteries from
the generator. It is an off grid system.
The inverter would start charging the batteries, but then about a
minute later they would hear a relay click and the charging would
stop. Then it would just keep cycling. If they turned everything off
for a while, they could then turn it back on and charge for maybe 10
minutes before it would start cycling. They just have a crappy 4kw
generator from Harbor Freight.
I have not laid my own eyes on it yet, but will be there in the next
day or two. Just wondering if anyone has experienced these symptoms
and have a good idea of what to look for first.
Thanks!
-Dave
*Dave Tedeyan, PE*
Senior Engineer | Taitem Engineering, PC
110 South Albany Street | Ithaca, NY 14850
o. _607.277.1118 x121_ f. 607.277.2119
www.taitem.com <http://www.taitem.com>
Solar •Sustainability • Energy • Design
Certified B-Corporation since 2013
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*Allan Sindelar*
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NABCEP Certified PV Installation Professional
New Mexico EE98J Journeyman Electrician
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