Reddit reviews DROK 1 Ultra Small 2 Cables voltímetro Gauge 0.36" DC 3.0 ~ 30 V Digital voltímetro Batería de coche Tester, Amarillo, 090561~
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Two-wire connection: Simply connect the red and black wire to positive and negative Pole respectivelyWith reversed connection protection, meaning meter will NOT burn when connected reversely0 36 inchTo acquire best accuracy, its Decimal point can move according to different tested voltage(if <10V, two digits show after Decimal point; if>10V, one digit shows after Decimal point)It can test Voltage of 18650 or Lithium battery, NiMH battery pack, MOTO, Auto, car, etc; screw potentiometer in back side for more accurate results
Absolutely worth it. I have an Engel fridge and I originally wasn't going to do solar. But I found that If I wanted to park for more than a day or if I didn't drive at least 50 miles everyday, the battery would slowly drain down to the cutoff point within a week. I installed one 100-watt panel and I can leave the van parked for as long as i want and the battery stays charged and I never have to turn off the fridge.
I just use a continuous-duty solenoid that connects the house and main batteries when the ignition is on for alternator charging. Nothing fancy. And a sunsaver charge controller for the solar here's a link list I made for a friend who installed a similar setup:
Solar Panel:
http://www.amazon.com/Grape-Solar-GS-STAR-100W-Polycrystalline-100-watt/dp/B00CAVMMMG/ref=sr_1_1?ie=UTF8&amp;qid=1438626722&amp;sr=8-1&amp;keywords=grape+solar
Mounting Feet:
http://www.amazon.com/Grape-Solar-GS-ZB-Fab1-Zippity-Off-Grid/dp/B00MS8AKUM/ref=sr_1_5?ie=UTF8&amp;qid=1438626722&amp;sr=8-5&amp;keywords=grape+solar
Connectors:
http://www.amazon.com/Islandoffer-Pairs-Female-Solar-Connectors/dp/B00A8TRKJW/ref=sr_1_1?ie=UTF8&amp;qid=1438633077&amp;sr=8-1&amp;keywords=MC4+connectors
Charge Controller (don't skimp here and don't get an MPPT controller for just a panel or three):
http://www.amazon.com/Morningstar-SS-20L-12V-SunSaver-Charge-Controller/dp/B007NNHUHI/ref=sr_1_3?ie=UTF8&amp;qid=1438633118&amp;sr=8-3&amp;keywords=sunsaver
Battery:
I got the x2 Power from Batteries plus. it's not bad, but the battery i should have gotten is this one:
http://www.amazon.com/Lifeline-GPL-27T-AGM-Battery/dp/B004OA25PU/ref=pd_sim_sbs_200_3?ie=UTF8&amp;refRID=0P8HYGYQ24QVWZARFF4Z - which Batteries plus should be able to get, which means less or no shipping.
Fuse Block:
http://www.amazon.com/Blue-Sea-Systems-Blade-Block/dp/B000THQ0CQ/ref=sr_1_cc_1?s=aps&amp;ie=UTF8&amp;qid=1438633797&amp;sr=1-1-catcorr&amp;keywords=blue+sea+fuse
Volt meter:
http://www.amazon.com/gp/product/B00BZPNICG?psc=1&amp;redirect=true&amp;ref_=oh_aui_search_detailpage
Solenoid:
http://www.amazon.com/gp/product/B0064MX7US/ref=pd_lpo_sbs_dp_ss_1?pf_rd_p=1944687442&amp;pf_rd_s=lpo-top-stripe-1&amp;pf_rd_t=201&amp;pf_rd_i=B0050I94XG&amp;pf_rd_m=ATVPDKIKX0DER&amp;pf_rd_r=0F2ZN9606RB53XSFR2EC