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Reviews (7)
Jan 06, 2016
No substitute for Curtis
2 of 2 found this helpful This looks like a great idea - a battery state of charge (SOC) meter that you can field-configure for nearly any common system voltage, and for any one of 3 battery chemistries, lead, LFP, or LiPo. There's also a setting for NiMH, which isn't mentioned in the Ebay listing, and the actual specs seem to suggest that you can use it for battery voltages as high as 96v (I didn't try it above 36v, however). The price for all this is great. Assembly quality appears OK.
I tested this meter with a 24v 12AH Werker AGM lead-acid battery and a 24v 10AH Ping LFP (lithium iron phosphate) battery. I didn't test it with LiPo or NiMH batteries, but I'd guess that the LiPo results would be similar to LFP,.
One of the problems with using battery voltage to measure SOC is that while voltage varies with SOC, it also varies with the amount of load. In a forklift, for example, a simple voltmeter calibrated in charge percentage might read 20% when lifting a load, 45% when carrying it, and 90% when stopped. This variation would confuse the operator, so Curtis and some other manufacturers average the load over time. They add a time constant that delays by several minutes the meter's response to changing voltage.
Unfortunately the designers of this meter left that feature out. The reading changes so much with varying loads that it doesn't really tell you the SOC.
It should still be useful for a constant load, so I tested it that way. I used a "Watt's Up" meter to track amp-hours. The SOC percentages shown are based on total measured battery capacity.
LEAD ACID BATTERY: fixed load, initial current 6.8A (0.57C). The SOC indication fell from 6 green bars to 3 green bars 9 seconds after I connected the load.
Here's what the display showed as the voltage fell during discharge:
3 green bars at 98% SOC (24.2v)
2 green bars at 65% SOC (23.6v)
1 green bar at 37% SOC (22.9v)
2 red bars at 19% SOC (22.3v)
1 red bar at 6% SOC (21.6v)
Although the display has 8 LEDs, only 5 of them are really used to indicate SOC. Despite the granularity, these 5 are at fairly useful voltage (SOC) points, and the red LEDs warn you when you get to 20% SOC. However, remember that the SOC display here is stable only if the load never changes, so it won't tell you much if you use it with a golf cart or forklift.
LFP BATTERY: fixed load, initial current 10.1A (1C). The SOC indication fell from 6 green bars to 4 green bars within a few seconds after I connected the load. Here's the display map for this one:
4 green bars at 98% SOC (25.1v)
3 green bars at 45% SOC (24.7v)
2 green bars at 19% SOC (23.9v)
1 green bar at 11% SOC (22.8v)
2 red bars at 8% SOC (22.3v)
1 red bar at 6% SOC (21.5v)
The designers don't seem to have taken into account lithium's flatter discharge curve. It looks like they just took the lead-acid curve and spread out the voltages a little to account for an 8-cell lithium battery's higher initial voltage.
The display doesn't change much until you've used over half the battery, with most of the action clustered in the last 20% of the charge. Trouble is, for good battery life you really want to stop and charge when you get to 20%. This means that you have only 3 useful LEDs. Worse, at 20% SOC it's still showing green; you don't get red until 8% SOC. That's not very good protection for your expensive battery.
In sum, if you're hoping for an equivalent of the Curtis battery meters at a fraction of the price, this isn't it. If you have a lead acid battery and a constant, predictable load like boat lights, this one will do an OK job. If you have a varying load, or a lithium battery, I can't really recommend it.
It does work pretty well as a plain voltmeter, but if that's all you need, there are plenty of other choices that have the voltage in bigger numbers.
Mar 31, 2021
Highest capacity lead battery that fits APC ES-500 UPS
Ebay has cheaper choices, but Powersonic is one of the more well regarded names in small nonspillable lead batteries; and this PS-1290-F2, made in Vietnam, is the highest amp-hour capacity battery that fits an APC ES-500 UPS. It replaces a Genesis NP7-12T, also from Vietnam, that lasted 3.5 years. I hope this one lasts as long as the Chinese-made Powersonic PS-1230 in my other UPS, which is 6 years old and still working.
Dec 25, 2017
Decent light-duty pigtail vehicle receptacle
Auto power (lighter) plugs are the ones mostly responsible for good contact. They have springs in both the positive and negative contacts. All the mating receptacle has to do is provide a clean, untarnished, sufficiently conductive shell of the right length and diameter, and a solid, low-resistance center contact. The plug does the rest.
There are only a few different pigtail vehicle receptacle designs offered on Ebay. As long as the pigtail is solidly connected to the contacts, and has a decent strain relief, any of them should do the job.
That said, whether these particular receptacles work for you will depend on what you're powering. They're not heavy-duty receptacles. Even if the receptacle itself might handle large currents (and I wouldn't want to warrant that), you shouldn't ask the attached AWG 18 pigtail to deliver more than about 7 amps. This is about half of what most cars' built-in receptacles can deliver. So you'll need to be careful what you connect to these receptacles. Adding a 7 amp inline fuse wouldn't be a bad idea.
Within their limitations, though, these simple, inexpensive Asian-made receptacles seem to work as well for light loads as any I've used.