Re: inverter problem and current limiting

From: Fritz Schlunder (me_at_privacy.net)
Date: 12/07/04 

Date: Tue, 7 Dec 2004 11:10:27 -0700

"Dave Moore" <dave.m.moore@baesystems.com> wrote in message
news:41b5e229$1_1@baen1673807.greenlnk.net...
> > What is the condition of the lead acid battery? Is it in good
condition?
> > Is the low voltage wiring connections to the battery using appropriately
> > large wire and oxidation free connections? The inverter surely includes
> an
> > input undervoltage lockout feature of some kind. If the battery is
quite
> > weak and is in need of charging or replacement (or the wiring/connection
> > resistance is too high), then the inverter will quite possibly cycle
like
> > you suggest.
>
> All of the equipment is brand new. The battery has been fully charged and
is
> outputing well over 12volts (over 13volts whilst charging). I'm pretty
sure
> the kit is in good condition.

> Anybody have any other ideas.

Hmm... Brand new equipment eh'? Good electrical connections (not connected
through something like a cigarette lighter socket or anything like that)?

How does the inverter behave when you hook up other loads such as
incandescent lightbulbs, compact fluorescent lamps, motors/powertools, large
transformers, other electronic equipment?

Modern laptop powersupplies do have input capacitors which are fairly large
(but some form of inrush limiting is already included in the supply, likely
an NTC or simple resistor), but the inverter should still have no problem
with it. It if can't even drive this then it can't drive a whole lot of
equipment, and if that is the case it is of a very poor design. I find it
hard to believe it is really that bad. Something else is not right. I
suppose it is possible the laptop powersupply might have a high power factor
input stage that expects to see a sinewave voltage source. If this is true,
and the inverter produces a squarewave, then it is conceivable the laptop
supply might behave badly, but still...

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