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
MrWizard wrote:
No problem with the shunt in line with the frame ground
Just so there are no other power carrying ground/negative wires connected at the battery
Oops. Good point. Thanks.
The solar charger and inverter have their own return lines to the neg post. They don't go thru the frame like the rest of the 12V circuits.
So I'll mount one end of the shunt on the negative post and the three neg wires to the shunt's other end ... somehow.
