Not a TriMetric, but for $20 might be worth trying out...
Bayite DC 6.5V-100V Digital ammeter voltmeter Amazon suggested this for me and I'm thinking for $20 I might just give it a try. Has very good reviews too.
Forum Discussion
Snowman9000 wrote:
I have not read the whole thread.
I installed two meters about the same as Mr Wizard got. I had a 200A one and a smaller one, 30 or 50A, I can't recall exactly. One for the whole house and one for the solar by itself.
After using them dry camping a few weeks last winter, I feel they are not all that accurate at measuring amps, unless you are in their sweet spot for current draw. I mean, they are "okay", barely. They will give you a rough idea of what you are charging or drawing.
...
Their Amp reading does have to be calibrated.
When I first installed my 100A version I only roughly calibrated to ~15A max. It was fine for our first outings, but now with our heavier loads, the Ah are way off.
One of my first projects when we return from this trip is to recalibrate, especially closer to our max expected load (~90A). I have a clamp-on Ammeter that will hopefully be a good reference.
